초록

A nonchromate rust preventive agent for aluminum which comprises a zirconium compound, a fluoride ion, a water-soluble resin and an aluminum salt. Also an aluminum product treated with the nonchromate rust preventive agent is provided.

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1. A nonchromate rust preventive agent for aluminum which comprisesa zirconium compound in an amount of 100 to 100000 ppm as zirconium ion, a fluoride ion in an amount of 125-125000 ppm, a water-soluble resin in an amount of 100 to 100000 ppm on a nonvolatile matter basis, and an aluminum salt in an

1. A nonchromate rust preventive agent for aluminum which comprisesa zirconium compound in an amount of 100 to 100000 ppm as zirconium ion, a fluoride ion in an amount of 125-125000 ppm, a water-soluble resin in an amount of 100 to 100000 ppm on a nonvolatile matter basis, and an aluminum salt in an amount of 10 to 10000 ppm as aluminum ion, wherein said water-soluble resin has a functional group selected from the group consisting of a carboxyl, a hydroxyl, a sulfo, and an amino group, which forms a bond with the zirconium compound, aluminum, or both, in film formation.